\documentclass[tikz,border=0.1cm]{standalone}

\usepackage{tikz}
\usepackage{pgfplots}
\usepackage{amsmath}

\pgfplotsset{compat=newest}

\begin{filecontents}{speed1.data}
1	42.61
2   45.43
3   45.99
4   45.37
5   42.24
6   36.90
7   32.65
8   34.37
9   37.09
10  33.09
11  25.20
\end{filecontents}

\begin{filecontents}{speed2.data}
11  25.20
12  16.55
13  24.89
14  33.48
15  38.96
16  43.39
17  45.01
18  45.28
19  44.65
20  42.97
21  41.04
22  38.08
23  39.45
24  40.41
25  39.41
26  37.30
\end{filecontents}

\begin{filecontents}{speed3.data}
26  37.30
27  35.57
28  36.46
29  39.85
30  42.33
31  41.85
32  44.51
33  45.05
34  44.45
35  41.47
36  36.30
37  32.72
38  34.45
39  36.68
40  33.00
41  25.99
\end{filecontents}

\begin{filecontents}{speed4.data}
41  25.99
42  18.61
43  25.82
44  33.59
45  39.40
46  42.70
47  45.33
48  46.20
49  45.23
50  42.03
51  37.69
52  33.43
53  35.75
54  37.17
55  32.57
56  24.98
57  18.33
58  26.58
59  33.05
\end{filecontents}

\begin{filecontents}{speed5.data}
59  33.05
60  40.26
61  41.29
62  44.32
63  45.39
64  45.11
65  42.16
66  36.90
67  32.92
68  33.84
69  36.24
70  33.15
71  25.93
72  19.16
73  24.25
\end{filecontents}

\begin{filecontents}{speed6.data}
73  24.25
74  30.92
75  38.17
76  41.60
77  44.24
78  45.49
79  45.28
80  43.17
81  39.65
82  34.20
83  34.34
84  36.82
85  32.93
86  28.15
87  25.24
88  28.93
89  33.23
90  39.34
\end{filecontents}

\begin{filecontents}{speed7.data}
90  39.34
91  41.93
92  44.50
93  45.79
94  45.61
95  43.76
96  40.76
97  35.56
98  35.55
99  37.76
100 33.38
101 28.69
102 27.10
103 30.10
104 33.98
105 39.77
\end{filecontents}

\begin{document}
\begin{tikzpicture}[domain=0:110]
\begin{axis}[
  height=3cm,
  width=7cm,
  axis x line=center,
  axis y line=center,
  xtick={15,30,45,60,75,90,105},
  ytick={0},
  xticklabels={\footnotesize$T$,\footnotesize$2T$,\footnotesize$3T$,\footnotesize$4T$,\footnotesize$5T$,\footnotesize$6T$,\footnotesize$7T$},
  yticklabels={},
  xlabel style={below left},
  ylabel style={below right},
  xmin=1,
  xmax=115,
  ymin=0,
  ymax=60]
\addplot[no marks,smooth,draw=gray!30,thick] file {speed1.data};
\fill[green!10,draw=gray!50] (11,0) rectangle (26,55);
\addplot[no marks,smooth,draw=cyan!60!blue,thick] file {speed2.data};
\addplot[no marks,smooth,draw=gray!30,thick] file {speed3.data};
\fill[green!10,draw=gray!60] (41,0) rectangle (73,55);
\addplot[no marks,smooth,draw=cyan!60!blue,thick] file {speed4.data};
\addplot[no marks,smooth,draw=cyan!60!blue,thick] file {speed5.data};
\addplot[no marks,smooth,draw=gray!30,thick] file {speed6.data};
\fill[green!10,draw=gray!60] (90,0) rectangle (105,55);
\addplot[no marks,smooth,draw=cyan!60!blue,thick] file {speed7.data};
\end{axis}
\end{tikzpicture}

\end{document}